What size outlets do class III standpipes have?

What size outlets do class III standpipes have?

• A. 1/2 and 1 inch
• B. 1 1/2 and 2 1/2 inch
• C. 2 and 3 inch
• D. 1 and 2 inch

Answer: (B)

Class III standpipes are designed to serve both firefighter attack lines and occupants’ hoses, so they provide two outlet sizes: a 2 1/2 inch outlet and a 1 1/2 inch outlet. The 2 1/2 inch size matches the standard fire-service hose used by firefighters, allowing rapid deployment of larger attack lines. The 1 1/2 inch outlet accommodates smaller hoses or portable equipment for occupants or initial attack. This dual sizing is what distinguishes Class III from the others: Class I uses only 2 1/2 inch outlets, and Class II uses only 1 1/2 inch outlets.

Class III standpipes are designed to serve both firefighter attack lines and occupants’ hoses, so they provide two outlet sizes: a 2 1/2 inch outlet and a 1 1/2 inch outlet. The 2 1/2 inch size matches the standard fire-service hose used by firefighters, allowing rapid deployment of larger attack lines. The 1 1/2 inch outlet accommodates smaller hoses or portable equipment for occupants or initial attack. This dual sizing is what distinguishes Class III from the others: Class I uses only 2 1/2 inch outlets, and Class II uses only 1 1/2 inch outlets.